[fix][broker] fix can not cleanup heartbeat data if scaling down broker

[TakaHiR07]

Main Issue: https://github.com/apache/pulsar/issues/21324

Motivation

Fix can not cleanup heartbeat data if scaling down broker

Modifications

when close the broker, delete heartbeat resource.

If the broker restart, the heartbeat resource would be recreate.

Verifying this change

• [] Make sure that the change passes the CI checks.

Documentation

• [ ] doc
• [ ] doc-required
• [x] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository: https://github.com/TakaHiR07/pulsar/pull/21